rust/src/libstd/sys_common, branch 1.45.2

Rollup merge of #72683 - RalfJung:char-debug-check, r=Mark-Simulacrum

2020-05-31T10:03:22+00:00

from_u32_unchecked: check validity, and fix UB in Wtf8 Fixes https://github.com/rust-lang/rust/issues/72760

encode_utf8_raw is not always valid UTF-8; clarify comments

2020-05-30T15:27:34+00:00

also expose and use encode_utf16_raw for wtf8

2020-05-30T10:11:21+00:00

wtf8: use encode_utf8_raw

2020-05-30T09:53:50+00:00

Add Extend::{extend_one,extend_reserve}

2020-05-30T00:05:17+00:00

This adds new optional methods on `Extend`: `extend_one` add a single element to the collection, and `extend_reserve` pre-allocates space for the predicted number of incoming elements. These are used in `Iterator` for `partition` and `unzip` as they shuffle elements one-at-a-time into their respective collections.

abort_internal is safe

2020-05-17T21:38:31+00:00

Replace `cfg` macro with attribute.

2020-05-02T15:06:16+00:00

Update name

2020-04-26T11:24:16+00:00

Add Read/Write::can_read/write_vectored

2020-04-26T11:23:39+00:00

When working with an arbitrary reader or writer, code that uses vectored operations may end up being slower than code that copies into a single buffer when the underlying reader or writer doesn't actually support vectored operations. These new methods allow you to ask the reader or witer up front if vectored operations are efficiently supported. Currently, you have to use some heuristics to guess by e.g. checking if the read or write only accessed the first buffer. Hyper is one concrete example of a library that has to do this dynamically: https://github.com/hyperium/hyper/blob/0eaf304644a396895a4ce1f0146e596640bb666a/src/proto/h1/io.rs#L582-L594

Add illumos triple

2020-04-14T20:36:07+00:00

Co-Authored-By: Jason King Co-Authored-By: Joshua M. Clulow